Answer:
11.2Watts
Step-by-step explanation:
Given parameters: 
Energy produced by the engine = 670J
Time taken = 1min = 60s 
Unknown: 
Number of watts it can output = ? 
Solution: 
This problem entails finding the power of the engine. 
Power is the rate at which work is being done. 
So; 
 Power = 
 
 
 Power = 
 = 11.2Watts
 = 11.2Watts